| 1983-1984 |
research assistant, Museum of the Institute
of Ethiopian Studies, Addis Ababa University, Ethiopia |
| 1987 |
Archaeological Survey in Harar, Eastern Ethiopia |
| 1989 |
Paleontological Inventory of Ethiopia in Kesem Kebena,
Central Ethiopia (with Dr. Tim D. White of the University
of California at Berkeley) |
| 1990 |
Paleontological Research at Fejej, Southern Ethiopia
(with Dr. John G. Fleagle of the State University of New
York at Stony Brook) |
| 1990 |
Archaeological and Paleontological Research in Middle
Awash, North-Central Ethiopia (with Drs. J. Desmond Clark
and Tim D. White, both of the University of California,
Berkeley) |
| 1992 |
Archaeological Research on the Prehistoric Ethiopian
Agriculture in Southern Ethiopia (with Dr. Steven A. Brandt
of the University of Florida, Gainesville) |
| 1993 |
Archaeological Research at Aksum, Northern Ethiopia (partly
with Dr. Rodolfo Fattovich of the University of Naples,
Italy and Dr. Katherine Bard, of Boston University) |
| 1996 |
Archaeological reconnaissance in Tigray, Northern Ethiopia
(director) |
| 1998-99 |
Excavations in Temben, northern Ethiopia, director |
| 2000 |
rescue excavations, Gilgel Ghibe, Ethiopia (with Dr.
S. A. Brandt) |
| 2003 |
Survey for obsidian geological sources, Central Ethiopia |
| 2004 |
Lithic analysis of Gilgel Ghibe, Ethiopia |
| 2005 |
Dikika (Afar, Ethiopia) paleoanthropological Research |
| 2005 |
Further survey for obsidian geological sources, Rift
Valley of Ethiopia |
